Energy flow — Paper 2 · IGCSE Sciences - Co-ordinated (Double) 0654

7 What is an ecosystem? A a chart showing the flow of energy from one organism to another B a diagram giving the energy level of an organism in its environment C a network of interconnected organisms D a unit containing all of the organisms and their environment

1 marks

Answer: D

This question in 0654/21 May/June 2017

5 Why do food chains usually have fewer than five trophic levels? A Decomposers are not usually included in the chain. B Energy is lost between each trophic level. C There is only one level of carnivores. D There is only one level of herbivores.

1 marks

Answer: B

This question in 0654/23 May/June 2017

10 Why do food chains usually have fewer than five trophic levels? A All the carnivores consume herbivores. B The energy passed on reduces from one trophic level to the next. C There is less protein in each individual higher up the chain. D There is only one producer in each chain.

1 marks

Answer: B

This question in 0654/21 Oct/Nov 2017

12 In a food chain, what do all living organisms get from their food? A a supply of water B oxygen for respiration C protection from disease D the energy they need

1 marks

Answer: D

This question in 0654/21 May/June 2019

12 The diagram shows the energy flow in an ecosystem. green Sun animals plants X Which group of organisms is X? A carnivores B decomposers C herbivores D producers

1 marks

Answer: B

This question in 0654/23 May/June 2019

12 Which statement about how organisms get their energy is not correct? organism source of energy A carnivores animals B decomposers dead plants C green plants minerals D herbivores plants

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2019

12 In the food chain shown, 10% of the energy is transferred between each trophic level. grass → grasshopper → frog → snake → buzzard For every 100 kJ of energy in the herbivore, how much energy will be transferred to the tertiary consumer? A 0.1 kJ B 1 kJ C 10 kJ D 100 kJ

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2019

12 Where does the principle source of energy for an ecosystem come from? A decay B the soil C the Sun D water

1 marks

Answer: C

This question in 0654/23 May/June 2020

12 What is the name given to a unit containing all of the organisms and their environment interacting together in a given area? A ecosystem B food chain C food web D trophic level

1 marks

Answer: D

This question in 0654/23 Oct/Nov 2020

12 Why do food chains usually have fewer than five trophic levels? A All the carnivores consume herbivores. B The energy passed on reduces from one trophic level to the next. C There is less protein in each individual higher up the chain. D There is only one producer in each chain.

1 marks

Answer: B

This question in 0654/21 May/June 2021

12 Why do food chains usually have fewer than five trophic levels? A All the carnivores consume herbivores. B The energy passed on reduces from one trophic level to the next. C There is less protein in each individual higher up the chain. D There is only one producer in each chain.

1 marks

Answer: B

This question in 0654/22 May/June 2021

12 Why do food chains usually have fewer than five trophic levels? A All the carnivores consume herbivores. B The energy passed on reduces from one trophic level to the next. C There is less protein in each individual higher up the chain. D There is only one producer in each chain.

1 marks

Answer: B

This question in 0654/23 May/June 2021

12 What is an ecosystem? A a chart showing the flow of energy from one organism to another B a diagram giving the energy level of an organism in its environment C a network of interconnected organisms D a unit containing all of the organisms and their environment

1 marks

Answer: D

This question in 0654/21 Oct/Nov 2021

12 What is an ecosystem? A a chart showing the flow of energy from one organism to another B a diagram giving the energy level of an organism in its environment C a network of interconnected organisms D a unit containing all of the organisms and their environment

1 marks

Answer: D

This question in 0654/22 Oct/Nov 2021

12 What is an ecosystem? A a chart showing the flow of energy from one organism to another B a diagram giving the energy level of an organism in its environment C a network of interconnected organisms D a unit containing all of the organisms and their environment

1 marks

Answer: D

This question in 0654/23 Oct/Nov 2021

12 What is the main factor which determines the number of trophic levels in food chains? A competition between organisms B efficiency of energy transfer between trophic levels C removal of a member of a food chain D unstable ecosystem due to changing environment

1 marks

Answer: B

This question in 0654/22 Feb/March 2022

12 The diagram shows the energy flow in part of an ecosystem. green Sun animals plants X Which group of organisms is X? A carnivores B decomposers C herbivores D producers

1 marks

Answer: B

This question in 0654/22 Feb/March 2023

12 Four processes that occur in mammals are listed. 1 muscle contraction 2 cell division 3 excretion 4 maintenance of a constant body temperature Which processes reduce the amount of energy available to the next trophic level? A 1, 2, 3 and 4 B 1 and 2 only C 1, 3 and 4 only D 4 only

1 marks

Answer: A

This question in 0654/21 Oct/Nov 2023

12 What is an ecosystem? A a network of interconnected food chains in a given area B all the members of one species in a given habitat C all the organisms and their environment interacting together in a given area D all the transfer of energy in a given habitat

1 marks

Answer: C

This question in 0654/23 Oct/Nov 2023

12 How does an organism in the first trophic level gain energy? A by absorbing energy from sunlight B by breaking down dead or waste organic matter C by eating organisms in the second trophic level D by eating plants

1 marks

Answer: A

This question in 0654/21 May/June 2024

12 What is an ecosystem? A a chart showing the flow of energy from one organism to another B a diagram giving the energy level of an organism in its environment C a network of interconnected food chains D a unit containing all of the organisms and their environment

1 marks

Answer: D

This question in 0654/22 May/June 2024

12 What is an example of an ecosystem? A a decomposing log and the organisms in it B a food chain C the network of burrows in which some rabbits live D the oak trees in a forest

1 marks

Answer: A

This question in 0654/21 Oct/Nov 2024

13 Which statement explains why food chains usually have fewer than five trophic levels? A All the carnivores consume herbivores. B The energy passed on decreases from one trophic level to the next. C There is less protein in each individual higher up the chain. D There is only one producer in each chain.

1 marks

Answer: B

This question in 0654/21 Oct/Nov 2025

13 What is the most energy efficient resource for humans to eat? A herbivores B primary consumers C producers D secondary consumers

1 marks

Answer: C

This question in 0654/23 Oct/Nov 2025